/*
 * Copyright (C) 2000-2008 Jens Nixdorf and various contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies of the Software, its documentation and marketing & publicity
 * materials, and acknowledgment shall be given in the documentation, materials
 * and software packages that this Software was used.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.mopore.jat.core.externalplugins;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mopore.jat.core.CorePlatformPlugin;
import org.mopore.jat.plugin.IJatPluginInternal;
import org.mopore.jat.plugin.PluginException;
import org.mopore.jat.plugin.PluginFileAccessJaxB;
import org.mopore.jat.util.Common;

public class PluginHouseKeeping {
	
	
	private final PluginFileAccessJaxB fileAccess;
	
	private final Log log = LogFactory.getLog(getClass().getName());

	private PluginHouseKeepingInfo info;

	private File pluginsFolder;
	
	private Map<String, String> loadedPluginsMap;

	public PluginHouseKeeping( File pluginsFolder ) throws PluginException {
		Class<? extends IJatPluginInternal> clazz = CorePlatformPlugin.class;
		this.fileAccess = new PluginFileAccessJaxB( clazz );
		this.pluginsFolder = pluginsFolder;
		try {
			this.info = fileAccess.retrieve( PluginHouseKeepingInfo.class );
			
		} catch (IOException e) {
			String message = "can not retrieve plugin housekeeping info";
			log.error( message, e );
			throw new PluginException( message, e );
		}
		this.loadedPluginsMap = new HashMap<String, String>();
	}
	
	public boolean deleteIfNecessary( String folderId ) throws PluginException {
		
		Set<String> idSet = info.getToDeleteIds();
		
		boolean isToDelete = idSet.contains( folderId );

		if ( isToDelete ) {
			try {
				File dirToDelete = new File( pluginsFolder, folderId );
				if ( dirToDelete.exists() ) {
					boolean result = Common.deleteDir( dirToDelete );
					if ( result == false ) {
						throw new PluginException( "Could not delete plugin:" + folderId );
					}
				}
				
				idSet.remove( folderId );
				info.setToDeleteIds( idSet );
				fileAccess.persist( info );
			} catch (IOException e) {
				String message = "Could not delete plugin: " + folderId;
				log.error( message, e );
				throw new PluginException( message, e );
			}
		}
		
		return isToDelete;
	}
	
	
	public void remove( String pluginName ) throws PluginException {
		
		String folderId = loadedPluginsMap.get( pluginName );
		
		Set<String> folderIdSet = info.getToDeleteIds();
		folderIdSet.add( folderId );
		info.setToDeleteIds( folderIdSet );
		try {
			fileAccess.persist( info );
		} catch (IOException e) {
			String message = "can not register plugin folder to delete";
			log.error( message, e );
			throw new PluginException( message );
		}
		try {
			deleteIfNecessary( folderId );
		}
		catch( Exception e ) {
			String message = "deletion can not be down yet but is registered for restart";
			log.info( message );
		}
	}

	
	public void register(String pluginName, String folderId ) {
		loadedPluginsMap.put( pluginName, folderId );
	}

}
